多分支水平对接井技术在土耳其天然碱溶采中的应用

Application of multi-lateral horizontal intersected well drilling technique in Turkish trona solution mining

摘要:

多分支井钻井技术是水平井技术的延伸和发展，是一种提高采收率及提高油气开采经济效益的技术手段，该技术已被广泛应用到油气田开发，但是用于开采可溶性矿产方面还不很常见。本文以土耳其卡赞天然碱溶采工程中的H032井为例，介绍了该技术在天然碱水溶开采中的应用。通过定向钻井技术，在一口主井中分支出2条平行井眼，分别与2口直井对接连通，形成2条采矿通道。在分析碱矿开采中应用多分支水平对接井技术施工难点的基础上，重点介绍了分支井钻井工艺技术，包括井身结构设计及优化、悬空分支技术、钻头及钻具组合设计及优化、钻井液设计等。

Abstract:

Multi-lateral well drilling is the extension and development of horizontal well drilling and an effective tool for improvement of oil and gas recovery and economics. It is widely applied in oil and natural gas exploitation, but rarely in soluble mineral production. In this paper, the application of the technique in trona mining is introduced in the case of H032 well drilling at the Kazan Trona Mine. With the help of directional drilling technique, two parallel horizontal laterals were drilled from one main well bore to connect two pairs of vertical wells respectively to form 2 mining passages. The difficulties in applying the technique in the trona mine projectis analyzed with focus on the multi-lateral drilling process, such as well structure design and optimization, suspended sidetrack drilling, drill bit and BHA design and optimization, drilling fluid design, etc.